The big picture: The new regulation defines bump stocks as attachable devices that "allow a shooter of a semiautomatic firearm to initiate a continuous firing cycle with a single pull of the trigger." Owners will be required to turn them in 90 days after the rule becomes law. Bump stocks faced national backlash last year after a gunman used them to modify his weapons and kill 59 people at an outdoor concert in Las Vegas.

2018 was a record year for school gun violence

The March for Our Lives protest in Washington. Photo: Visions of America/UIG via Getty Images

There have been a record 94 incidents of gun violence in schools across the United States in 2018 — a nearly 60% jump from the previous high set in 2006, according to data from the U.S. Naval Postgraduate School.

The big picture: The database, which stretches back to 1970, records any incident in which a gun is "brandished, is fired, or a bullet hits school property for any reason," per The Guardian. The February school shooting in Parkland, Florida, which resulted in 17 deaths, helped to reinvigorate a national movement against gun violence. The student-led March for Our Lives demonstration earlier this year saw more than 1.7 million people march in 752 protests across the U.S.